On Thu, 27 Jun 2002 09:31:39 -0500, Christopher Ferraro <[log in to unmask]> wrote: >X-Sender: [log in to unmask] LISTSERV does not pay attention to X-Sender: or any other RFC822 Field beginning with 'X'. So this field is ignored by LISTSERV. LISTSERV would pay attention to Sender: [log in to unmask] From: [log in to unmask] but in that case the error message would say the [log in to unmask] address was not authorized. Last idea I can think of is if the email client program might accidentally have a non-visible 'control' character in the email address (should not happen) which LISTSERV is seeing and responding too. Unless you do not have a support contract with L-Soft, I suggest it is time to write to them ([log in to unmask]) so you can show them the complete and unmodified list header/message header/log file segment without the hidden names and other modifications you have made which may be obscuring the real problem.